D, E, F, X, Y, and Z live on six different floors of a building numbered 1 (bottom floor) to 6 (top floor). D lives on a floor below F. Only two people live between E and X. Only one person lives below E. Y lives on an odd-numbered floor, but not on floor 5. Z lives on an even-numbered floor. Who lives on the topmost floor?

Seven boxes P, Q, R, S, T, U and V are kept one over the other but not necessarily in the same order. Only four boxes are kept between P and Q. Only R is kept above P. Only two boxes are kept between U and T. V is kept immediately above S. T is not kept immediately above V. How many boxes are kept below T?

Each of seven persons F, G, H, L, M, N and O has an exam on a different day of the week from Monday to Sunday. G has an exam on Friday. Only two people have exams between M and G. Only four people have exams between F and M. N has an exam immediately after O. L does not have an exam on Monday. How many people have exams between L and H?